[firedrake] pytest error in parallel

Dear All, I re-installed firedrake with the install script. After it has been installed, I get the following error when I do a parrallel test with pytest. E CalledProcessError: Command 'mpiexec -n 2 /home/hyamazak/firedrake/bin/python -c "import test_nonlinear_gw_nh_novort; test_nonlinear_gw_nh_novort.test_total_energy_parallel()"' returned non-zero exit status 1 How can I fix it? The full error message is found here: https://gist.github.com/anonymous/b87288483d6b1d22543e267c9142c315 All the best, Hiroe